Scps Chemistry Worksheet With Answers - Periodicity printable pdf download

SCPS Chemistry Worksheet – Periodicity

A. Periodic table

1. Which are metals? Circle your answers:

C, Na,

Cs,

Ba,

Which metal in the list above has the most metallic character? Explain.

Cesium – as the largest atom, the lowest ionization energy and the most reactivity with nonmetals. This

can be determined by its position lowest in the alkali metal group.

2. Write the charge that each of the following atoms will have when it has a complete set of

valence electrons forming an ion.

O –

- none

3. What is the most common oxidation number for calcium? Explain.

The last page of the powerpoint on Chemistry, Atoms and Ions provides the definition of oxidation number

as the charge on the ion. You were also asked to define this term in your element brochure. Pages 222 and

980 of your text book defines oxidation number as the positive or negative charge of a monatomic (one

atom) ion. These numbers may be confirmed on many of the websites you have used

Calcium will have a 2+ oxidation number as it tends to easily lose its 2 valence electrons, the 4s

electrons

4. Name two more elements with that oxidation number and explain your choice.

Other alkaline earth metals (group 2) will also have 2+ oxidation numbers since they all have 2 s valence

electrons that they easily lose. This would include Be, Mg, Sr, Ba and Ra.

5. What element in period 3 is a metalloid?

Silicon – Si is the only metalloid in period three.

6. When element with atomic number 118 is discovered, what family will it be in?

Element 118 should be a noble gas, as 118 electrons would arrange to fill 7p sublevel

7. Make an argument for placing hydrogen in the halogen family rather than the alkali metals.

Since Hydrogen – H has 1 valence electron it is usually placed in the alkali metal group, as that

electron is found in the s sublevel. However, the 1s sublevel has room for only 2 electrons. This

creates a situation where the sublevel needs only 1 more electron to be complete. Members of the

halogen family also only need one electron to complete their sublevel (p). Therefore, hydrogen

would fit in this group as well – if the group was defined as needing only one more electron to

complete a sublevel rather than the s AND p sublevels.

8. The

alkali metals

have a single electron in the highest energy level.

9. The

alkaline earth metals

achieve the electron configurations of noble gases by losing 2 e-

10. The

transition metals

vary in the number of electrons in the highest energy level

11. The

halogens

achieve the electron configuration of noble gases by gaining one electron.

12. The

noble gases

have full s and p orbitals in the highest occupied energy levels.

13. The

noble gases

are stable and un-reactive

(inert)

14. The

halogens

are highly reactive and readily form salts with metals.

15. The

alkaline earth metals

are metals that are more reactive than the transition elements but

less reactive than the alkali metals.

16. Predict the oxidation number based on the electron configuration shown.

(2+)

0 (none)

(1+)

(1-)

(3+)

Scps Chemistry Worksheet With Answers - Periodicity

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